CVE-2021-41838

CVE-2021-41838 affects Insyde H2O SdHostDriver in the kernel 5.0–5.5. The vulnerability enables an attacker with local access to trigger a System Management Mode (SMM) callout and execute arbitrary code due to a Numeric Range Comparison Without a Minimum Check in SdHostDriver. Across connected so...

CVE-2021-42059

CVE-2021-42059 affects Insyde InsydeH2O Kernel 5.0 (before 05.08.41), 5.1 (before 05.16.41), 5.2 (before 05.26.41), 5.3 (before 05.35.41), and 5.4 (before 05.42.20). The issue is a stack-based buffer overflow in the UEFI DisplayTypeDxe DXE driver that leads to arbitrary code execution. The vulner...

CVE-2021-42554

CVE-2021-42554 concerns an SMM memory corruption in InsydeH2O’s FvbServicesRuntimeDxe, allowing an attacker to write fixed or predictable data to SMRAM and potentially escalate to System Management Mode. Affected firmware is InsydeH2O with Kernel 5.0 before 05.08.42, 5.1 before 05.16.42, 5.2 befo...

CVE-2020-27339

CVE-2020-27339 affects InsydeH2O kernel 5.x, where several SMM drivers (AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, SdMmcDeviceDxe) fail to validate the CommBuffer and CommBufferSize, allowing memory corruption of firmware or OS memory. The issue is fixed in kernel 5.1–5.5 with specifi...

CVE-2020-5953

CVE-2020-5953 affects InsydeH2O UEFI firmware, where the System Management Interrupt (SWSMI) handler dereferences EFI_RUNTIME_SERVICES (gRT) to call GetVariable outside SMRAM, enabling code execution in SMM and privilege escalation. Impact is local and architectural, as described in multiple sour...

CVE-2021-33626

CVE-2021-33626 affects InsydeH2O’s SMM code, specifically the SmmResourceCheckDxe driver, where a SWSMI handler registers without proper validation of the CommBuffer pointer, enabling data corruption in SMRAM and potential arbitrary code execution. Connected vendor disclosures confirm this vulner...

CVE-2021-33625

Mode C: Normal (concrete details present) Vulnerability: InsydeH2O firmware (Kernel 5.x) used by HddPassword suffers an SMM/SMI buffer validation flaw. Software SMI services that use the EFI_SMM_COMMUNICATION_PROTOCOL’s Communicate() do not verify the buffer address, enabling access to SMRAM, MMI...

CVE-2021-41837

CVE-2021-41837 affects InsydeH2O’s AhciBusDxe driver in kernel versions 5.0–5.5. The flaw stems from an Untrusted Pointer Dereference that can corrupt SMM memory (SMRAM) and enable a local attacker to escalate privileges to System Management Mode. Public documentation (NVD/Tenable, Binarly/CERT a...

CVE-2021-33627

CVE-2021-33627 affects Insyde InsydeH2O 5.x (FwBlockServiceSmm). The SMM Communicate() handling does not validate the buffer address, enabling use of SMRAM, MMIO, or OS kernel addresses. Impact: local attacker could escalate to SMM execution and potentially compromise SMRAM or firmware. Fixed in ...